Threaded connection and insert



` Nov. 28, 1944. I H 1 FlNDLEY 2,363,662

THREADED CONNECTION AND INSERT Filed Aug. `1:5, 1943 12 a, INVENTOR.

firm/WE f5 Patented Nov. 28, 1944 UNITED STATES PATENT OFFICE THREADEDCONNECTION AND INSERT Howard J. Findley, Shaker Heights, Ohio, as-

signor to Eaton Manufacturing Company, Cleveland, Ohio, a corporation ofOhio Application August 13, 1943, Serial No. 498,493

1 Claim.

This invention relates to threaded connections threads oii aconventional American National form thereon and wherein the wire is of acrosssectional shape such that it has correspondingI internal andexternal threads of said conventional American National form thereon.This novel insert makes it possible to obtain a strong screw connectionbetween such threaded members even though one of the members is made ofa relatively soft material, and also results in an advantage oftremendous practical importance because `existing conventional threadingdies, taps and other tools can be used in forming the threads on themembers which are to be connected by the insert.

Other objects and advantages of the invention will be apparent from thefollowing description when taken in conjunction with the accompanyingsheet of drawings in which,

Fig. 1 is a sectional view taken through a threaded connection madeaccording to the present invention and in which substantially equalportions or amounts of the wire of the insert extend into the threadgrooves of the members connected by the insert;

Fig. 2 is a longitudinal sectional view taken through the connectinginsert or bushing;

Fig. 3 is an end View thereof; and

Figs. 4 and 5 are partial longitudinal sectional views taken throughother threaded connections made according to the present invention butin which unequal pprtions of the wire of the insert extend into theYthread grooves of the members connected by the insert.

More detailed reference will now be made to the accompanying drawingswherein I have illustrated one form of my novel insert or bushing andshow threaded donnectons in which this insert is used. My novel insertcan be used for -a variety of practical purposes, for example, it

can be used in bodies of relatively soft material for receiving a screwor stud and, when so used, provides a stronger connection thanif thescrew r stud were screwed directly into such material.

This insert can also be used as a bushing or` adapter in any bodiesormaterials where it is desirable to connect internally and externallythreaded members having standard or conventional threads of the samepitch but of dilerent nominal diameters.

` facturing plants.

` In Fig. 1 I show a threaded connection com- 4 prising a pair ofinternally and externally threaded members I0 and II and in which mynovel insert I2 is disposed between such members and forms a connectiontherebetween. this instance the externally threaded member II is in therform oia screw having a head Ila and a threaded stem IIb. The internallythreaded or female member I may be any body with which an externallythreaded member is to be connected such as a body of aluminum, steel,wood, fiber, plastic or the like. In this instance I show the screw IIbeing used to connect a plate or other part I3 to the member I0.

The insert I2 is in the form of a bushing or sleeve comprising a numberof turns or convolutions of helically woundv wire. One end of the wiremay be deflected to extend substantially diametrically across the insertas shown-in Figs.'

2 and 3 to form a transverse bar or tang I4 to which a suitable-tool orwrench may be, applied for screwing the insert into the internallythreaded or female member I0. The wire from which the insert I2 isformed may be made of steel or any 'other suitable metal or alloy andpreferably is resilient in character and of `a tensile strength suchthat the insert will beV tough and p strong and will retain its shapewhile being screwed into the threaded opening.

An important feature of the present invention residesL in the fact thatthe insert I2 is made of wire of a cross-sectional shape such that themembers to be connected by the insert can have threads of a standard orconventional form which permits these members to be threaded. byconventional taps and dies which `are already available and are standardequipment in most manu- As shown in Fig. 1 the internally threaded orfemale member III is provided with asubstantially cylindrical openingI0a having therein the helical thread Illb which may y be of aconventional American National form. The externally threaded or malemember Il has thereon a similar thread I Ic of a conventional AmericanNational form and which is of theV same pitch as the' thread IDb but ofa smaller nominal diameter. For example, the thread llc of the member Ilmay be a r'%"24 thread and the thread Ib may be a %"24 thread. As shownin Fig. l of the drawing, the external and internal diameters of themale and female members are held substantially to the diameters whichare conventional for the American National threads provided `on thesemembers.

'I'he wire from which the bushing |21 is made is of a cross-sectionalshape such that the insert preferably such that the threads I2a and I2balso have a 60 included angle. The Wire of the insert I2 is wound to thesame pitch as the pitch of the threads Illb and IIb and the diameter ofthe insert and the thickness of the wire are such that the externalthread I2a of theinsert will conform substantially to the thread Ib oftheMmember I and the internal thread I2b of the insert will conformsubstantially to the external thread IIc of the member II. In otherwords, for the above example, the insert I2 would have a 151;"-24internal thread and a %"24 externalthread. My invention alsocontemplates a screw series in which the above-described insert would befurnished in sizes to serve pairs of internally and externally threadedmembers having standard or conventional threads of the same pitch but ofdifferent nominal diameters.

In forming a threaded connection using my novel insert I2, the femalemember I0 is'tapped., or drilled and tappedas the case may be, toprovide the standard or conventional thread I0b therein. The insert I2is then screwed into the threaded opening Illa by means of a tool orwrench which engages the bar or tang I4 of the insert. The threadedportion of the male member II is then screwed into the insert andthereafter the insert forms a connecting element between the twothreaded members.

In the threaded connection shown in Fig. 1, substantially equalvportions of the wire extend into the thread grooves of the members I0and II being connected by the insert. In some instances, however, theportions of wire extending into the threads 'of the connected membersare unequal as shown in Figs. 4 and 5. In Fig. 4 an insert I5, similartothe insert I2, connects internally and externally threaded members I6and II which have standard or conventional threads I6a and I'Ia'. In theconnection here shown one-half of the wire of the insert extends intothe thread grooves of the member Il While a little less than one-half ofthe wire of the insert extends into the thread grooves of the member I6.This condition would occur for certain combinations of threadedmale'andfemale members for example when the male member I'I hasfa 541"-18 threadand the femalel member I6 has a Taf-18 thread.

In Fig. 5 an insert I8, which is similar to the insert I2, connectsinternally and externally threaded members I9 and 20 with nearlyone-half of the wire of the insert extending into the thread groovesA ofthe member 20 and somewhat less than one-half extending into the threadgrooves of the member I9. The condition here represented would occur forcertain combinations of male and female members such as when the malemember 20 has a 1"-14 thread and the female member I9 has a %14 thread.y

In all cases however, the threads of the insert substantially ll thethread grooves of the members which are connected by the insert and astrong and reliable connection can thus be provided between variousmembers to be connected.

From the foregoing description and accompanying drawing, it will now bereadily understood that .I have provided'a novel insert which can beused for a variety of practical purposes and with which a strong andreliable connection can be formed. It will be seen'furthermore that byusing a wire of diamond cross-sectional shape forthe insert, thelthreads thereof will be of a shape to substantially fill the threadgrooves of the members to be connected and such members can havestandard or conventional threads and hence can be threaded by the use ofexisting taps and dies.'

While I have illustrated and described my novel insert and threadedconnection in more or less detail, itwill be understood of course that Ido not wish to be limited to the particular features and details hereindescribed but regard my invention as includingall changes andmodifications coming within the spirit of the linvention and the scopeof the appended claim.

Having thus described my invention, I claim: Y

external and internal diameters of said male and female members beingheld to `the diameters which are conventional for the American Nationalthreads thereon, said helicallycoiled wire having a cross-sectionalshape and pitch such that the insert has internal and external threadsof said conventional American National form and pitch so as to permittheuse of existing conventional threading tools in forming the threadson the threaded portions of the male and female `members to be connectedby said insert `HOWARD J FINDLEY.

